CN220646340U - Hydraulic system of integral die-casting forming machine - Google Patents

Abstract

The utility model relates to a hydraulic system of an integrated die-casting forming machine, wherein when the hydraulic system is quickly lowered, pressure oil is supplied to a first working oil port of a sub-cylinder through a first pressure oil circuit, a first pressure oil branch circuit and a first working oil circuit, and the sub-cylinder drives a master cylinder to be quickly lowered. During pressing, the pressure oil is supplied to the first working oil port of the sub-cylinder through a first pressure oil circuit, a first pressure oil circuit and a first working oil circuit, and is supplied to the second working oil port of the master cylinder through the first working circuit, so that the master cylinder is pressed. When the hydraulic cylinder rises, the pressure oil is supplied to the third working oil port of the master cylinder through the first pressure oil way and the second working oil way, the second working oil port of the master cylinder returns to the oil tank through the first working branch and the oil return way, the first working oil port of the slave cylinder returns to the oil tank through the first working oil way and the oil return way, and meanwhile, the liquid filling valve is opened, and the hydraulic cylinder returns to the oil tank directly. The hydraulic system of the integrated die-casting forming machine has ingenious structure, can realize the actions of quick down, pressing and rising of the master cylinder and the slave cylinder, and has good die-casting effect.

Description

Hydraulic system of integral die-casting forming machine

Technical Field

The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic system of an integrated die-casting forming machine.

Background

In the die casting production process, the oil cylinder needs to finish actions of quick descending, pressing and ascending, so that the purpose is to compact the die casting structure and reduce internal defects. And when the integral die-casting forming machine adopts the master cylinder and the slave cylinder, the master cylinder rapidly ascends and descends along the master cylinder and pressurizes to complete die casting, and the descending speed is high and the die casting effect is good. The prior art does not disclose a hydraulic system special for oil supply of a master cylinder and a slave cylinder.

Disclosure of Invention

In view of the foregoing drawbacks of the prior art, it is an object of the present utility model to provide an integrated die casting machine hydraulic system that solves one or more of the problems of the prior art.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a hydraulic system of an integral die-casting forming machine comprises an oil supply assembly and an oil cylinder;

the oil supply assembly comprises an oil tank, an oil outlet of the oil tank is connected with a first pressure oil path, and an oil return port of the oil tank is connected with an oil return path;

a sub-cylinder and a main cylinder sleeved outside the sub-cylinder are arranged in the oil cylinder, a liquid filling valve is arranged on the oil cylinder, and a valve port of the liquid filling valve is connected with an oil tank;

the first pressure oil way is connected with a first pressure oil way through a proportional logic valve, the rear end of the first pressure oil way is connected with the front end of a first working oil way and the front end of a second working oil way through a first electromagnetic reversing valve, the rear end of the first working oil way is connected with a first working oil port of a sub cylinder, the rear end of the second working oil way is connected with a third working oil port of a master cylinder, the rear end of the first pressure oil way is connected with the rear end of the oil return way through a fourth electromagnetic reversing valve, the rear end of the liquid filling way is connected with a pilot port of the liquid filling valve, the liquid filling way is used for controlling the opening and closing of the liquid filling valve, and the two ends of the first working oil way are respectively connected with the first working oil way and the second working oil port of the master cylinder;

the first working branch is connected with a third logic valve, the third logic valve is used for controlling the on-off of the first working branch, the second working oil is sequentially provided with a second logic valve and a balance valve, the second logic valve is used for controlling the on-off of the second working oil, and the third logic valve is connected with the balance valve through a third pilot control branch and is used for controlling the on-off of a valve port of the balance valve through reversing.

Further, the first pressure oil branch is connected with a pilot control oil way through a first damping plug, the rear end of the pilot control oil way is respectively connected with a pilot port of a first electromagnetic directional valve and a pilot port of a proportional logic valve, the first pressure oil branch is connected with a fourth oil return branch through a third pressure oil branch provided with a second damping plug, and the fourth oil return branch is connected with a pilot valve of a first motor pump set.

Further, the oil return port of the oil tank is connected with a third oil return branch, the second logic valve comprises a first cone valve and a second electromagnetic directional valve, the first cone valve is connected to the second working oil path and is positioned between the first electromagnetic directional valve and the balance valve, one end of the second electromagnetic directional valve is connected with a first cone valve port and the third oil return branch, the other end of the second electromagnetic directional valve is connected with a first cone valve pilot port and a first pilot control branch, a first logic valve port is connected between the first working oil path and the oil return path, the pilot port of the first logic valve is connected with the first pilot control branch through a third damping plug, the second logic valve is used for controlling the connection and disconnection between the first working oil path and the oil return path through switching of the first logic valve port.

Furthermore, the pilot control oil way is connected with the third oil return branch through the first overflow valve and the proportional overflow valve.

Further, the third logic valve comprises a second cone valve and a third electromagnetic directional valve, the valve port of the second cone valve is connected to the first working branch, one end of the third electromagnetic directional valve is connected with the pilot port of the second cone valve, the other end of the third electromagnetic directional valve is connected with a fourth pilot control branch and a third pilot control branch, the fourth pilot control branch is connected with the first working branch, and the third electromagnetic directional valve controls the opening and closing of the valve port of the second cone valve and the opening and closing of the valve port of the balance valve through direction change.

Further, the oil outlet of the oil tank is also connected with a second pressure oil way, the other end of the second pressure oil way is connected with an oil return way, a second motor pump set is arranged on the second pressure oil way, and a water cooler is arranged at the rear end of the second motor pump set on the second pressure oil way.

Further, the front end of the first pressure oil way is provided with a signaling butterfly valve and a shock absorbing throat, the rear end of the first pressure oil way, which is positioned at the first motor pump group, is provided with a high-pressure filter, and the front end of the oil return way is provided with an oil return filter.

Furthermore, the oil return port of the oil tank is also connected with a second oil return branch, the other end of the second oil return branch is connected with a pilot outlet of the first electromagnetic directional valve, the first pressure oil branch is connected with a second pressure oil branch, and the oil return path is also connected with a bearing flushing oil path and a fifth oil return branch.

Further, an air filter, a vacuum sensor, a cleaning cover, a liquid level meter, a liquid level relay and a water flow indicator are arranged on the oil tank.

Further, the oil return path is also connected with a ball valve, and a fifth electromagnetic reversing valve is arranged between the oil return path and the ball valve.

Compared with the prior art, the utility model has the following beneficial technical effects:

according to the hydraulic system of the integrated die-casting forming machine, when the hydraulic system is fast lowered, pressure oil is supplied to the first working oil port of the sub-cylinder through the first pressure oil path, the first pressure oil path and the first working oil path, the sub-cylinder drives the main cylinder to be fast lowered, the liquid filling valve is opened to absorb oil from the oil tank under the action of negative pressure, and the third working oil port of the main cylinder returns oil to the oil tank through the second working oil path and the oil return path. During pressing, the pressure oil is supplied to the first working oil port of the sub-cylinder through the first pressure oil circuit, the first pressure oil circuit and the first working oil circuit, is supplied to the second working oil port of the master cylinder through the first working circuit, the master cylinder is pressed, and the third working oil port of the master cylinder is returned to the oil tank through the second working oil circuit and the oil return circuit. When the hydraulic cylinder rises, the pressure oil is supplied to the third working oil port of the master cylinder through the first pressure oil way and the second working oil way, the second working oil port of the master cylinder returns to the oil tank through the first working branch and the oil return way, the first working oil port of the slave cylinder returns to the oil tank through the first working oil way and the oil return way, and meanwhile, the liquid filling valve is opened, and the hydraulic cylinder returns to the oil tank directly. The hydraulic system of the integrated die-casting forming machine has ingenious structure, can realize the actions of quick down, pressing and rising of the master cylinder and the slave cylinder, and has good die-casting effect.

Drawings

Fig. 1 shows a schematic structural diagram of an oil supply assembly in a hydraulic system of an integral die-casting molding machine according to an embodiment of the present utility model.

Fig. 2 shows a schematic structural diagram of a valve block in a hydraulic system of an integral die casting machine according to an embodiment of the present utility model.

Fig. 3 is a schematic view showing a part of a hydraulic system of an integral die casting machine according to a first embodiment of the present utility model.

Fig. 4 shows a schematic structural diagram of an oil cylinder in a hydraulic system of an integral die-casting forming machine according to an embodiment of the present utility model.

The reference numerals in the drawings:

1. an oil tank; 11. an air filter; 12. a vacuum sensor; 13. cleaning the cover; 14. a liquid level gauge; 15. a liquid level relay; 16. a water flow indicator; 17. a bracket; 18. a ball valve; 19. a fifth electromagnetic directional valve; 2. an oil cylinder; 21. a sub-cylinder; 211. a first working oil port; 22. a master cylinder; 221. a second working oil port; 222. a third working oil port; 223. a charging valve; 23. a first working oil path; 231. a first working branch; 24. a second working oil path; 3. a first pressure oil path; 31. a first pressure oil branch; 311. a first damping plug; 32. a second pressure oil branch; 33. a third pressure oil branch; 331. a second damping plug; 301. sending out a signal to the butterfly valve; 302. shock absorbing throat; 303. a first motor pump unit; 304. a high pressure filter; 305. a proportional logic valve; 41. an oil return path; 411. an oil return filter; 42. a first oil return branch; 43. the second oil return branch circuit; 44. a third oil return branch; 45. a fourth oil return branch; 46. bearing cleaning oil way; 47. a fifth oil return branch; 5. a second pressure oil path; 51. a second motor pump unit; 52. a water cooler; 53. a one-way valve; 54. an electromagnetic water valve; 6. a pilot control oil path; 61. a first overflow valve; 62. a proportional overflow valve; 71. a first electromagnetic directional valve; 72. a first logic valve; 721. a first pilot control branch; 722. a third damping plug; 73. a second logic valve; 731. a first cone valve; 732. a second electromagnetic directional valve; 733. a second pilot control branch; 734. fourth damping plug; 74. a balancing valve; 741. a safety valve; 742. a third pilot control branch; 743. fifth damping plug; 75. a third logic valve; 751. a second cone valve; 752. a third electromagnetic directional valve; 753. a fourth pilot control branch; 754. sixth damping plug; 76. a fourth electromagnetic directional valve; 761. a fifth pilot control branch; 762. seventh damping plug; 763. a liquid filling path.

Detailed Description

For a better understanding of the utility model with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that any modifications, changes in the proportions, or adjustments of the sizes of structures, proportions, or otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or essential characteristics thereof.

In the description of the present utility model, the positional or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In order to more clearly describe the structure of the hydraulic system of the integral die-casting forming machine, the utility model defines terms of a far end and a near end, specifically, a front end refers to an end, close to an oil return port and an oil outlet port of the oil tank 1, of an oil path, a rear end refers to an end, far away from the oil return port and the oil outlet port of the oil tank 1, of the oil path, taking fig. 1 as an example, a lower end of the first pressure oil path 3 in fig. 1 is a front end, and an upper end of the first pressure oil path 3 in fig. 1 is a rear end.

Example 1

Referring to fig. 1, 2, 3 and 4, a hydraulic system of an integral die casting molding machine comprises an oil supply assembly and an oil cylinder 2;

the oil supply assembly comprises an oil tank 1, an oil outlet of the oil tank 1 is connected with a first pressure oil way 3, and an oil return port of the oil tank 1 is connected with an oil return way 41;

a sub-cylinder 21 and a main cylinder 22 sleeved outside the sub-cylinder 21 are arranged in the oil cylinder 2, a liquid filling valve 223 is arranged on the oil cylinder 2, and a valve port of the liquid filling valve 223 is connected with the oil tank 1;

the first pressure oil way 3 is connected with the first pressure oil way 31 through a proportional logic valve 305, the rear end of the first pressure oil way 31 is connected with the front end of the oil return way 41 through a first electromagnetic directional valve 71, the front end of the first working oil way 23 is connected with the front end of the second working oil way 24, the rear end of the first working oil way 23 is connected with the first working oil port 211 of the sub-cylinder 21, the rear end of the second working oil way 24 is connected with the third working oil port 222 of the master cylinder 22, the rear end of the first pressure oil way 31 is connected with the front end of the first working way 231 and the front end of the oil return way 41 through a fourth electromagnetic directional valve 76, the rear end of the oil return way 763 is connected with a pilot port of the oil filling valve 223, the oil return way 763 is used for controlling the opening and closing of the oil filling valve 223, and the two ends of the first working way 231 are respectively connected with the first working oil way 23 and the second working oil port 221 of the master cylinder 22;

the first working branch 231 is connected with a third logic valve 75, the third logic valve 75 is used for controlling the on-off of the first working branch 231, the second working oil path 24 is sequentially provided with a second logic valve 73 and a balance valve 74, the second logic valve 73 is used for controlling the on-off of the second working oil path 24, and the third logic valve 75 is connected with the balance valve 74 through a third pilot control branch 742 provided with a fifth damping plug 743 and controls the opening and closing of a valve port of the balance valve 74 through reversing.

Referring to fig. 1, 2 and 3, further, the first pressure oil branch 31 is connected to the pilot control oil path 6 through a first damping plug 311, the rear end of the pilot control oil path 6 is connected to a pilot port of the first electromagnetic directional valve 71 and a pilot port of the proportional logic valve 305, the first pressure oil branch 31 is connected to the fourth oil return branch 45 through a third pressure oil branch 33 provided with a second damping plug 331, and the fourth oil return branch 45 is connected to a pilot valve of the first motor pump set 303 for adjusting the flow rate of the oil pump.

Referring to fig. 1, 2 and 3, further, the front end of the oil return path 41 is connected in parallel to the first oil return branch 42, so as to increase the oil return speed. The oil return path 41 is also connected to a bearing cleaning oil path 46.

Referring to fig. 1, 2 and 3, further, the oil return port of the oil tank 1 is connected to the third oil return branch 44, the second logic valve 73 includes a first cone valve 731 and a second electromagnetic directional valve 732, the first cone valve 731 is connected to the second working oil path 24 and is located between the first electromagnetic directional valve 71 and the balancing valve 74, one end of the second electromagnetic directional valve 732 is connected to the first cone valve 731 and the third oil return branch 44, the other end of the second electromagnetic directional valve 732 is connected to the first pilot control branch 721, the second pilot control branch 733 is connected to the first cone valve 731, a fourth damping plug 734 is disposed between the second pilot control branch 733 and the second working oil path 24, the first working oil path 23 is connected to the valve port of the first logic valve 72 through the third damping plug 722, the pilot port of the first logic valve 72 is connected to the first pilot control branch 721 through the third damping plug 722, the second logic valve 73 is used for controlling the opening and closing of the valve port of the first logic valve 72, and the first logic valve 72 is used for controlling the connection and disconnection between the first working oil path 23 and the oil return path 41.

Referring to fig. 2, further, the pilot control oil path 6 is connected to the third oil return branch 44 through the first relief valve 61 and the proportional relief valve 62, so as to ensure the stable oil pressure of the pilot control oil path 6.

Referring to fig. 3, further, the third logic valve 75 includes a second cone valve 751 and a third electromagnetic directional valve 752, where a valve port of the second cone valve 751 is connected to the first working branch 231, one end of the third electromagnetic directional valve 752 is connected to a pilot port of the second cone valve 751, the other end of the third electromagnetic directional valve 752 is connected to a fourth pilot control branch 753 provided with a sixth damping plug 754 and a third pilot control branch 742 provided with a fifth damping plug 743, the other end of the fourth pilot control branch 753 is connected to the first working branch 231, and the third electromagnetic directional valve 752 controls the opening and closing of the valve port of the second cone valve 751 and the opening and closing of the valve port of the balancing valve 74 through direction switching.

Referring to fig. 3, a relief valve 741 is further connected between the balance valve 74 and the oil return path 41. The fourth electromagnetic directional valve 76 is connected to the first pressure oil path 3 through a fifth pilot control branch 761 provided with a seventh damping plug 762, and the fourth electromagnetic directional valve 76 is used for reversing and controlling the opening and closing of the charging valve 223.

Referring to fig. 1, further, the oil outlet of the oil tank 1 is further connected to a second pressure oil circuit 5, the other end of the second pressure oil circuit 5 is connected to an oil return circuit 41, a second motor pump unit 51 is disposed on the second pressure oil circuit 5, a water cooler 52 is disposed on the second pressure oil circuit 5 and located at the rear end of the second motor pump unit 51, the second pressure oil circuit 5 is used for absorbing oil from the oil tank 1, and the hot oil returns to the oil tank 1 through the oil return circuit 41 after exchanging heat through the water cooler 52. The second pressure oil way 5 is arranged at the rear end of the water cooler 52 and is provided with a one-way valve 53, the water cooler 52 is connected with an electromagnetic water valve 54, and the electromagnetic water valve 54 is used for controlling the on-off state of the water cooler 52.

Referring to fig. 1, further, the first motor pump unit 303 is disposed on the bracket 17 of the oil tank 1, the first motor pump unit 303 includes an oil pump and a motor, the oil pump is connected to the motor through a bell coupling, the motor is used for driving the oil pump to absorb oil, and the oil pump is further connected to a pilot valve for adjusting oil pressure. The second motor pump unit 51 comprises an oil pump and a motor, wherein the oil pump is connected with the motor through a bell coupling, and the motor is used for driving the oil pump to absorb oil.

Referring to fig. 1, further, a signaling butterfly valve 301 and a shock absorbing throat 302 are disposed at the front end of the first pressure oil path 3, a high pressure filter 304 is disposed at the rear end of the first motor pump set 303 of the first pressure oil path 3, an oil return filter 411 is disposed at the front end of the oil return path 41, the high pressure filter 304 and the oil return filter 411 are used for reducing and controlling pollution impurities in a hydraulic system, protecting an oil pump and other hydraulic elements, and the cleanliness of the system reaches NAS9 level.

Referring to fig. 1, 2 and 3, further, the oil return port of the oil tank 1 is further connected to a second oil return branch 43, the other end of the second oil return branch 43 is connected to the pilot outlet of the first electromagnetic directional valve 71, the first pressure oil branch 31 is connected to the second pressure oil branch 32, the second pressure oil branch 32 is used for supplying oil to the flushing device, the oil return path 41 is further connected to a fifth oil return branch 47, and the fifth oil return branch 47 is used for returning oil to the flushing device.

Referring to fig. 1, further, an air filter 11, a vacuum sensor 12, a cleaning cover 13, a level gauge 14, a level relay 15, and a water flow indicator 16 are disposed on the oil tank 1.

Referring to fig. 1, further, the oil return path 41 is further connected to the ball valve 18, and a fifth electromagnetic directional valve 19 is disposed between the oil return path 41 and the ball valve 18, where the fifth electromagnetic directional valve 19 is used to change the direction of the oil path, so as to implement oil filling and oil discharging.

The specific working procedure of the utility model is as follows:

when the integral die-casting forming machine is fast down, the first electromagnetic directional valve 71 is electrically switched to enable the first pressure oil branch circuit 31 to be connected with the first working oil circuit 23, the oil return circuit 41 to be connected with the second working oil circuit 24, the second electromagnetic valve is electrically switched to enable the valve port of the first cone valve 731 to be connected with the first pilot control branch circuit 721, the second pilot control branch circuit 733 to be connected with the third oil return branch circuit 44, and the third electromagnetic directional valve 752 and the fourth electromagnetic directional valve 76 are not electrically switched to be in a state shown in the figure; the first motor pump group 303 is started, the motor drives the oil pump to absorb oil from the oil tank 1, the pressure oil supplies oil to the first working oil port 211 of the sub-cylinder 21 through the first pressure oil path 3, the first pressure oil branch 31 and the first working oil path 23, the sub-cylinder 21 drives the main cylinder 22 to quickly descend, the liquid filling valve 223 is opened to absorb oil from the oil tank 1 under the action of negative pressure, and the third working oil port 222 of the main cylinder 22 returns oil to the oil tank 1 through the second working oil path 24 and the oil return path 41.

When the integral die-casting forming machine is pressed, the third electromagnetic valve is electrified and commutated to open the valve port of the second cone valve 751, the pressure oil is supplied to the first working oil port 211 of the sub-cylinder 21 through the first pressure oil path 3, the first pressure oil branch 31 and the first working oil path 23, the oil is supplied to the second working oil port 221 of the master cylinder 22 through the first working branch 231, the master cylinder 22 is pressed, and the third working oil port 222 of the master cylinder 22 returns to the oil tank 1 through the second working oil path 24 and the oil return path 41.

When the integral die casting molding machine is lifted, the first electromagnetic directional valve 71 is electrified and commutated to connect the first pressure oil branch 31 with the second working oil path 24, the oil return path 41 is connected with the first working oil path 23, the second electromagnetic valve is not electrified, the state is as shown in fig. 3, the valve port of the first cone valve 731 is connected with the second pilot control branch 733, the first pilot control branch 721 is connected with the third oil return path 44, the third electromagnetic directional valve 752 is not electrified, the state is as shown in fig. 3, the fourth electromagnetic directional valve 76 is electrified, the first pressure oil branch 31 is connected with the liquid filling path 763, the first working branch 231 is connected with the oil return path 41, the pressure oil is supplied to the third working oil port 222 of the master cylinder 22 through the first pressure oil path 3 and the second working oil path 24, the second working oil port 221 of the master cylinder 22 is returned to the oil tank 1 through the first working branch 231 and the oil return path 41, the first working oil port 211 of the slave cylinder 21 is returned to the liquid tank 1 through the first working oil path 23 and the oil return path 41 is opened, and the valve 223 is opened at the same time, and the first working oil return port 21 is returned to the oil tank 1 is directly returned to the master cylinder 1.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A hydraulic system of an integral die-casting forming machine is characterized in that: comprises an oil supply assembly and an oil cylinder;

the oil supply assembly comprises an oil tank, an oil outlet of the oil tank is connected with a first pressure oil path, and an oil return port of the oil tank is connected with an oil return path;

a sub-cylinder and a main cylinder sleeved outside the sub-cylinder are arranged in the oil cylinder, a liquid filling valve is arranged on the oil cylinder, and a valve port of the liquid filling valve is connected with an oil tank;

the first pressure oil way is connected with a first pressure oil way through a proportional logic valve, the rear end of the first pressure oil way is connected with the front end of a first working oil way and the front end of a second working oil way through a first electromagnetic reversing valve, the rear end of the first working oil way is connected with a first working oil port of a sub-cylinder (21), the rear end of the second working oil way is connected with a third working oil port of a master cylinder, the rear end of the first pressure oil way is connected with the rear end of the oil way through a fourth electromagnetic reversing valve, the rear end of the liquid filling way is connected with a liquid filling valve pilot port, the liquid filling way is used for controlling the opening and closing of the liquid filling valve, and the two ends of the first working oil way are respectively connected with the first working oil way and the second working oil port of the master cylinder;

the first working branch is connected with a third logic valve, the third logic valve is used for controlling the on-off of the first working branch, the second working oil is sequentially provided with a second logic valve and a balance valve, the second logic valve is used for controlling the on-off of the second working oil, and the third logic valve (75) is connected with the balance valve through a third pilot control branch provided with a fifth damping plug and is opened and closed through a valve port of the reversing control balance valve.

2. An integral die casting machine hydraulic system as defined in claim 1, wherein: the first pressure oil branch is connected with a pilot control oil way through a first damping plug, the rear end of the pilot control oil way is connected with a pilot port of a first electromagnetic directional valve and a pilot port of a proportional logic valve respectively, the first pressure oil branch is connected with a fourth oil return branch through a third pressure oil branch provided with a second damping plug, and the fourth oil return branch is connected with a pilot valve of a first motor pump set.

3. An integral die casting machine hydraulic system as defined in claim 2, wherein: the oil tank oil return port is connected with a third oil return branch, the second logic valve comprises a first cone valve and a second electromagnetic directional valve, the first cone valve is connected to the second working oil path and is positioned between the first electromagnetic directional valve and the balance valve, one end of the second electromagnetic directional valve is connected with a first cone valve port and the third oil return branch, the other end of the second electromagnetic directional valve is connected with a first cone valve pilot port and a first pilot control branch, a first logic valve port is connected between the first working oil path and the oil return path, the pilot port of the first logic valve is connected with the first pilot control branch through a third damping plug, the second logic valve is used for controlling the opening and closing of the first logic valve port through reversing, and the first logic valve is used for controlling the connection and disconnection between the first working oil path and the oil return path.

4. A hydraulic system for an integral die casting machine as defined in claim 3 wherein: and the pilot control oil way is connected with the third oil return branch through the first overflow valve and the proportional overflow valve.

5. A hydraulic system for an integral die casting machine as defined in claim 3 wherein: the third logic valve comprises a second cone valve and a third electromagnetic directional valve, the valve port of the second cone valve is connected to the first working branch, one end of the third electromagnetic directional valve is connected with a pilot port of the second cone valve, the other end of the third electromagnetic directional valve is connected with a fourth pilot control branch and a third pilot control branch, the fourth pilot control branch is connected with the first working branch, and the third electromagnetic directional valve is used for controlling the opening and the closing of the valve port of the second cone valve and the opening and the closing of the valve port of the balance valve through reversing.

6. An integral die casting machine hydraulic system as defined in claim 1, wherein: the oil outlet of the oil tank is also connected with a second pressure oil circuit, the other end of the second pressure oil circuit is connected with an oil return circuit, a second motor pump set is arranged on the second pressure oil circuit, and a water cooler is arranged at the rear end of the second motor pump set on the second pressure oil circuit.

7. An integral die casting machine hydraulic system as defined in claim 1, wherein: the front end of the first pressure oil way is provided with a signaling butterfly valve and a shock absorbing throat, the rear end of the first pressure oil way, which is positioned at the first motor pump set, is provided with a high-pressure filter, and the front end of the oil return way is provided with an oil return filter.

8. An integral die casting machine hydraulic system as defined in claim 2, wherein: the oil tank returns the oil port and still connects the second oil return branch road, the second oil return branch road other end is connected the guide's export of first electromagnetic directional valve, connect the second pressure oil branch road on the first pressure oil branch road, the bearing washes oil circuit, fifth oil return branch road still are connected to the oil return way.

9. An integral die casting machine hydraulic system as defined in claim 1, wherein: the oil tank is provided with an air filter, a vacuum sensor, a cleaning cover, a liquid level meter, a liquid level relay and a water flow indicator.

10. An integral die casting machine hydraulic system as defined in claim 9, wherein: the oil return path is also connected with a ball valve, and a fifth electromagnetic reversing valve is arranged between the oil return path and the ball valve.